Drill a hole an inch or so above the hook,run a string through it to the hook,pull the string, the hook lifts.
My simple minded .02
I use these. The latch is screwed to the sidewall and the "L" shaped bracket to the door. The threaded rod is adjustable and pulls the door snug when canterlevered into the closed position. They are available in with a five or seven inch threaded rod. I like the seven inch.